linux-kernel - Re: (subset) [Patch v2 0/2] Fix hang due to CPU BW request as BPMP suspended

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Message-ID: <ZSk53KRLZK-i3ETU@orome.fritz.box>
Date:   Fri, 13 Oct 2023 14:36:44 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     jonathanh@...dia.com, krzysztof.kozlowski@...aro.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sumit Gupta <sumitg@...dia.com>
Cc:     bbasu@...dia.com
Subject: Re: (subset) [Patch v2 0/2] Fix hang due to CPU BW request as BPMP
 suspended

On Fri, Oct 13, 2023 at 02:25:12PM +0200, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> 
> On Mon, 09 Oct 2023 15:35:55 +0530, Sumit Gupta wrote:
> > This patch set fixes hang during system resume which started coming
> > after adding Memory Interconnect and OPP support to the Tegra194 CPUFREQ
> > in below change:
> >  f41e1442ac5b ("cpufreq: tegra194: add OPP support and set bandwidth").
> > 
> > Tegra194 CPUFREQ driver uses 'CPUFREQ_NEED_INITIAL_FREQ_CHECK' flag
> > which causes a CPU frequency set request from the 'cpuhp_cpufreq_online'
> > hotplug notifier during resume. The CPU frequency set call also triggers
> > a DRAM bandwidth set request but the BPMP driver hasn't resumed yet
> > which results in hang during resume.
> > 
> > [...]
> 
> Applied, thanks!
> 
> [2/2] memory: tegra: set BPMP msg flags to reset IPC channels
>       (no commit info)

For the record, I've actually applied both patches, but applying them to
different branches (i.e. resulting in two subsets for the same series)
seems to have confused b4.

Thierry

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